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Using TVS Diode P6KE across relay coil but then also relay coil is getting damaged.

Former Member

We are using TVS diode across 24V DC-100AMPs relay for automotive application but my relay coil is getting damaged.

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  • Hi Amol,

    The diode is not usually there to protect the coil but to protect other semiconductor components from the voltage spike caused by the coil when it is de-energized. Usually the only way to damage a coil is to put voltage on it that is outside its specifications. Also you might check to see that the relay is designed for AC or DC volts. Using a relay rated for 24 volts AC would get excessively hot if used on 24 volts DC. It would also help to diagnose your problem if you would include a diagram of your circuit and how you have the diode connected in the circuit. Also if you can explain how the coil is being damaged. (heat damage?, shorted?, open?)

    John

  • Former Member
    Former Member in reply to jw0752

    beat me to it!!

     

    Also remember that the 24v 100a rating is for the circuit thats being switched, the coil might have a different power rating altogether.

     

    If you would draw a quick diagram and also post the make/model of the relay, you might find that the high currents might cause a moment of arcing from one of the switch contacts into the coil (often at those ratings the switch is operated by a solenoid that cam get zapped) in such a case, a diode in series might be better than across both legs.

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  • Former Member
    Former Member in reply to jw0752

    beat me to it!!

     

    Also remember that the 24v 100a rating is for the circuit thats being switched, the coil might have a different power rating altogether.

     

    If you would draw a quick diagram and also post the make/model of the relay, you might find that the high currents might cause a moment of arcing from one of the switch contacts into the coil (often at those ratings the switch is operated by a solenoid that cam get zapped) in such a case, a diode in series might be better than across both legs.

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